could dog
Regular verb: dog - dogged- dogged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could dog
you could dog
she could dog
we could dog
you could dog
they could dog 	I could be dogging
you could be dogging
she could be dogging
we could be dogging
you could be dogging
they could be dogging	I could have dogged
you could have dogged
she could have dogged
we could have dogged
you could have dogged
they could have dogged	I could have been dogging
you could have been dogging
she could have been dogging
we could have been dogging
you could have been dogging
they could have been dogging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't dog
you couldn't dog
she couldn't dog
we couldn't dog
you couldn't dog
they couldn't dog 	I couldn't be dogging
you couldn't be dogging
she couldn't be dogging
we couldn't be dogging
you couldn't be dogging
they couldn't be dogging	I couldn't have dogged
you couldn't have dogged
she couldn't have dogged
we couldn't have dogged
you couldn't have dogged
they couldn't have dogged	I couldn't have been dogging
you couldn't have been dogging
she couldn't have been dogging
we couldn't have been dogging
you couldn't have been dogging
they couldn't have been dogging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I dog?
could you dog?
could she dog?
could we dog?
could you dog?
could they dog? 	could I be dogging?
could you be dogging?
could she be dogging?
could we be dogging?
could you be dogging?
could they be dogging? 	could I have dogged?
could you have dogged?
could she have dogged?
could we have dogged?
could you have dogged?
could they have dogged? 	could I have been dogging?
could you have been dogging?
could she have been dogging?
could we have been dogging?
could you have been dogging?
could they have been dogging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I dog?
couldn't you dog?
couldn't she dog?
couldn't we dog?
couldn't you dog?
couldn't they dog? 	couldn't I be dogging?
couldn't you be dogging?
couldn't she be dogging?
couldn't we be dogging?
couldn't you be dogging?
couldn't they be dogging? 	couldn't I have dogged?
couldn't you have dogged?
couldn't she have dogged?
couldn't we have dogged?
couldn't you have dogged?
couldn't they have dogged? 	couldn't I have been dogging?
couldn't you have been dogging?
couldn't she have been dogging?
couldn't we have been dogging?
couldn't you have been dogging?
couldn't they have been dogging?